#background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    min-width: 1000px;
    background-repeat: no-repeat;
    background: linear-gradient(to bottom, #009 0%, #1E9FFF 100%);
    background-size: cover;
    -webkit-background-size: cover;
    -o-background-size: cover;
}

.filter {
    background: #009;
    animation: colorChange 30s ease-in-out infinite;
    animation-fill-mode: both;
    mix-blend-mode: overlay;
    z-index: -2;
}

@keyframes colorChange {
    0%, 100% {
        opacity: .2;
    }
    50% {
        opacity: .7;
    }
}


.top-head {
    position: absolute;
    margin: auto;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
}

.logo {
    margin: 0;
    float: left;
    height: 60px;
    cursor: pointer;
}

.logo img {
    border-radius: 50%;
    height: 60px;
    width: 60px;
    margin-top: -3px;
}

.name {
    height: 60px;
    weight: 100px;
    margin-left: 10px;
    padding: 0;
    font-size: 1.5em;
    font-family: Georgia;
    font-style: oblique;
    color: #1a75ff;
}

.top {
    opacity: 0.8;
    width: 100%;
    float: left;
    height: 60px;
    border-radius: 10px;
    background-color: #f3f5f7;
    line-height: 60px;
    margin-top: 20px;
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    justify-content: space-around;
}

.float_l {
    float: left;
}

.float_r {
    float: right;
}

.top_l {
    padding-left: 20px;
    float: left;
    width: 25%;
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    justify-content: left;
}

.top_m {
    float: left;
    width: 50%;
    height: 60px;
    position: relative;
}

.top_m ul {
    height: 60px;
    margin: auto;
    padding-left: 0;
    padding-right: 0;
    width: 100%;
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    justify-content: space-around;
}

.top_m li {
    width: 15%;
    float: left;
    margin: 0 3%;
    cursor: pointer;
    font-size: 20px;
}

li a p {
    width: auto;
    height: 60px;
    padding: 0 5%;
    color: black;
    line-height: 60px;
    text-align: center;
}

.top_r {
    float: left;
    width: 25%;
    padding-right: 20px;
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    justify-content: center;
    height: 60px;

    cursor: pointer;
    position: relative;
}

.user {
    width: 200px;
    font-size: 15px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.u-pic {
    width: 40px;
    height: 40px;
    margin: 10px;
}

.userpic {
    border-radius: 50%;
    width: 40px;
    height: 40px;
    position: relative;
    top: 0;
    bottom: 0;
}

.menu {
    float: right;
    width: 120px;
    height: 300px;
}

#user-menu {
    display: none;
    font-size: 15px;
    position: absolute;
    overflow: hidden;
    background: linear-gradient(to bottom, rgba(243, 245, 247, 0.8), rgba(243, 245, 247, 1));
    left: 78%;
    top: 80px;
    border-top: 0;
    box-shadow: 0px 2px 4px rgba(0, 0, 0, 0.16);
    border-radius: 0 0 10px 10px;
    width: 15%;
    z-index: 99;
    opacity: 1;
    text-align: center;
    list-style: none;
}

#user-menu li {
    cursor: pointer;
    margin: 0;
    height: 40px;
    line-height: 40px;
}

#user-login {
    text-align: left;
}


.selected {
    background-color: #1E9FFF;
    color: #ffffff;
}

.selected a p {
    color: #ffffff;
}

.unselected {
    color: #000000;
}

body, p, ul, ol, li, img, div, a {
    margin: 0;
    padding: 0;
    border: 0;
    font-family: Microsoft Yahei, "宋体", Arial;
    font-weight: normal;
    font-style: normal;
    text-decoration: none;
    list-style: none;
}

a:hover {
    text-decoration: none;
}

@media (min-width: 768px) {
    .top-head {
        max-width: 750px;
    }
}

@media (min-width: 992px) {
    .top-head {
        max-width: 970px;
    }
}

@media (min-width: 1200px) {
    .top-head {
        max-width: 1170px;
    }
}


